package chapter05;

public class example8 {
    public static void main(String[] args) {
        System.out.println("1,添加------------------------");
        add();
        System.out.println("1,删除------------------------");
        remove();
        System.out.println("1,修改------------------------");
        alter();

    }
    public static void add(){
        StringBuffer sb = new StringBuffer();
        sb.append("itcast");
        System.out.println(sb);
        sb.insert(2,"123");
        System.out.println(sb);
    }
    public static void  remove() {
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.delete(1,5); //指定范围删除
        System.out.println("删除指定位置结果：" + sb);
        sb.deleteCharAt(2); //指定位置删除
        System.out.println("删除指定位置结果：" + sb);
        sb.delete(1,sb.length()); //清空缓冲区
        System.out.println("清空缓冲区结果：" + sb);
    }
    public static void alter(){
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.setCharAt(1,'p');//修改指定位置字符
        System.out.println("修改指定位置字符结果：" + sb);
        sb.replace(1,3,"qq"); //替换指定位置字符串或字符
        System.out.println("替换指定位置字符（串）结果：" + sb);
        System.out.println("字符串翻转结果：" + sb.reverse());
    }
}